Half to henry a



(No Model.)

N. LOMBARD. GAR BRAKE.

No. 492,891. 'Patented Mar. '7 ,718931 TH: nomas Ps1-sns oo. #Nom-urne..wAsHmmoN,

NITE@ STATES' PATENT Thron.

NATHANIEL LOMBARD, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TOHENRY A. CLARK, OF SAME PLACE. t

CAR-BRAKE.

SPECIFICATION formingpart of Letters Patent No. 492,891, dated March 7,1893.

Application filed January 3, 1893. Serial No. 456.988. (No model.)

To @ZZ whom it may concern/' Be it known that I, NATHANIEL LOMBARD, acitizen of the United States, residing at Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Oar-Brakes; and I do hereby declare the kfollowing: tobe a full, clear, and exact description of the invention, such as willenable others skilled inthe art to which it appertains to make andusetthe same, reference being had to the accompanying drawings, and tofigures of reference marked thereon, which form a part of thisspecification.

This invention relates to that class of brakemechanism, in which themomentum of the car to which it is attached serves to apply the brake.

This invention, as herein shown and described is intended especially forelectric street-cars, and its purpose is to relieve'the motor-man fromall labor incidental to the setting of the brakes.

The mechanism embodying my invention is so arranged that a very slightmovement of the brake-rod serves to check the car. This act is effectedwith little or no effort on the part of the motor-man, since I have soconnected the several parts, that all the power required to set thebrakes shall be derived from the momentum of the car itself.

Briey stated my improvements consist in a rotary wheel or drum affixedupon the axle, a pair of friction-shoes or plates pivotally secured to acollar loosely uponr the axle and adapted to grip the drum; said collaris operated by a lever-arm attached to the brake-rod chains. Further inan oscillating arm, also loosely upon the axle and surmounted with asegmental plate adapted to be united With the brake-lever, together withrods, which connect the friction shoes with the segmental plate in orderthat a pull conveyed to the chains may be transmitted to thebrake-lever.

The drawings represent in Figure 1. a side elevation of brake mechanismembodying my invention. Fig. 2 is a vertical section on line a: Fig. 3is a plan of the same. Fig. 4 is an edge view of the friction-shoe. Fig.5. shows side and edge views of the friction-shoe lever. Fig. 6represents similar views of an arm carrying the segmental plate.

In the drawings 2 represents an axle to which brake .mechanism embodyingmy invention is applied. Preferably in electric cars I employ that axlewhich is interconnected with the motor, since this part of the runninggear always has the geatestmomentum, and is the last to come to rest;hence the advantage of its application at this particular point isapparent. v Positively attached to said axle is a wheely or disk 3 withasleeve 4 upon the opposite ends of which are loosely mounted similarhubs 5 with projectingarms 6 6'; the latter are controlled by rods orchains 7 7 connecting Withthe brake-levers, not shown, at opposite endsof the car. These chains are secured in a grooved segmental plate 8which surmounts the arms, in order to bring t-he pull lengthwise of andin the direction of the chains themselves.

Furthermore loosely mounted upon the hubs 5 5 are collars 9 9 eachfurnished With a lever 10, 10'; these latter are respectively unitedwith rods or chains 12, 12 which extend to and are controlled by thebrake-rods, not shown, at either end of the car, as usual. Since thelevers 10, 10 each have a connection or chain to the respectivebrake-rods, and in order to equalize their action upon the brake-rods, Ihave supplied a spreader or tie bar 19 which is united to a single chainor rod 2O leading to the brake-rods. In this way the effect of eachlever is transmitted to the brake-beam (not shown) by means'of thechains 7 7.

(1o-operating with the revoluble disk 3 are a pair of fricton-shoes 13,13', which are pivotally supported at the ends of two short rods 14, 14loosely secured at 15, 15 such points being preferably diametricallypositioned in the collar 9. By this arrangement it will be seen, thatVery slight rocking of either of the levers 10 10 will serve to draw oneof the friction shoes against the periph- IOO The operation is asfollows; assuming that the axle and disk are moving in the direction vindicated by the arrow, should the brake-rod be operated, the chain12,now the active one,

is shortened with the result to rock the lever in the direction of thepull of the chain. As a consequence the point on the collar is lowered.But since it moves in the line ot a tangent from the position in whichit isn'owl shown, the friction-shoe 13 is drawn against the revolvingsurface of the disk 3. l/Vhen frictional contact occurs the shoe tendsto rotate at the same speed as the disk, but this tendency is checked,bythe rod. 16. Hence the friction-shoes are pressed more` or` lesstightly against the disk, so does the pull upon the chains 7. 7 vary,such pull being transferredv directly lthrough the rods 16, 16 to thearms 6. 6', which are free to oscillate as occasion requires. In theinstance above described and in the application of the frictionshoe 13,the effect is to transmit the strain or pull, to the chain 7fand operatethe brake-lever, which is controlled by said chain. Conversely when the`brakerod united. with the rod', 12.y is operated the brake-levers 10are oppositely actuated and tension is put upon the chain 7.

Among the advantages of this mechanism is the simplicity of the partsand, their small number, only a very few pieces being required,

and'these can be attached; to any car without l part of the motor-manaccompanied by a small movement of the brake-rod serves to produce apowerful leverage upon the brakes to set the latter.

What I claim is- 1. The combination with a revoluble axle, and a diskaffixed upon the same, of nonrev oluble levers independently operated bythe brake-rods, friction shoes attached to said levers, rocking armswith chains to brake-levers, and positive means to unite the frictionshoes with the rocking arms, substantially as specitied.

2. In brake-mechanism, a revoluble axle, a sleeve disk rigid thereupon,and pivoted rocking shoes to co-operate With said disk, combined with apair of rockingarms furnished with hubs loosely upon saidi sleeve, a`pair ot levers with4 collarsvloosely upon said hubs, rodswhich unite thefriction shoes. to said levers, and positive means to interconnect theshoes with the arms, as likewisemeans to join the armswith thebrake-levers, substantially NATI-.IAN IEL*` LOMBARD.

Witnesses:

H. E. LODGE, FRANCIS C. STANWOOD.

